Yes, yes: you're already pretending you're the Dark Knight in probable Game of the Year candidate Batman: Arkham City. But what if you've been waiting to pretend to pretend you're one of Batman's crew of crimefighters? You'll finally get your chance when Warner Bros. releases Gotham City Impostors—the downloadable first-person shooter Kotaku previewed here—in January of next year. There'll be a beta launching next month that will let you build a member of the Bats or Jokerz factions and test drive a homebrew avenger of the night or crime clown. A sign-up site for the beta is live now.